Abstract: Reactivation of mass movements in the Warsaw slope, which resulted in a major construction failure of two buildings, indicate a need to update the geomorphologic analysis and evaluation of slope stability in that area. The area is located near the st. Orszady and st. Kiedacza and is at risk due to increase in the development intensity and the future localization of the Southern Beltway of Warsaw. The analysis of slope stability in this study was preceded with a review of the archive for a proper assessment of geological and geomorphological conditions. Next, measurements by using electrical resistivity tomography were conducted. The final stage of the study are stability calculations of the slope performed in accordance with Bishop’s method. The results of this study allowed to evaluate the possibility of a landslide.